The problem is that the lens has become stuck in the barrel. There are some DIY solutions you could try, but the
probability is that you will have to get it fixed by a professional.

Use
these at own risk as it may further damage the camera.

Firstly ,
try connecting your ac adapter or usb cable.

Try holding the
shutter button while switching on the camera.

Look at the lens ,
and if some of the lens 'circles' is misaligned or not concentric then
try wiggling it (while holding camera lens down).

Try gently
pushing or pulling the lens when it extends but this is risky as it may
cause the lens barrel to slip out of its guidance system.

Another
way to do this is to place the camera lens down on a hard surface and
then power it up. Be sure to use a soft cloth or something similar as to
not scratch your lens or casing. Let the lens push the camera up and
down a few times and sometimes the little resistance provided by the
camera is enough to get things going again.

Try hitting your
camera near the lens on the body with the soft tissue on the palm of
your hand.

Other than that , I would take the camera to a repair
center for a evaluation to see if it would cost more to repair than to
replace the camera.

If it is still under warranty I would suggest
you take it in before trying any of these steps and remove any
off-brand batteries or accessories as some stores are really fussy about
warranty repairs on camera's with non-brand accessories.

Hope
the advise is useful. Please do not hesitate to let me know if you need any further assistance.

1 Suggested Answer

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Hi,The black screen problem means the lens sensor is spoiled due to over exposure to heat. Its better to give it to Nikon service center. If your camera is under warranty period its well and good they will replace the lens sensor for free of cost.Thank you

Hi,The black screen problem means the lens sensor is spoiled due to over exposure to heat. Its better to give it to cannon service centre. If your camera is under warranty period its well and good they will replace the lens sensor for free of cost.Thank you

Hi,The black screen problem means the lens sensor is spoiled due to over exposure to heat. Its better to give it to cannon service centre. If your camera is under warranty period its well and good they will replace the lens sensor for free of cost.Thank you

Since the screen went black BEFORE the lens retracted, it makes me think this is a main board problem. The only other possibility is that it is the lens assembly, but since it went black BEFORE the lens retracted, I don't think that is it. I can replace the main board for $40, or you can send it to pentax in Arizona, and they will do it for about $90.
The main board is NOT something that I would suggest anyone try to replace as a DIY project. There are too many small screws, and delicate connections to deal with.
You can contact me at: mrfixitmark at comast dot net

If you just want to sell the camera as-is, I also buy all pentax a10, a20, a30, a40 cameras, in any condition.

That sounds like a sticky lens shutter. They usually have to be replaced, as they usually will need parts. When the camera is working look inside the lens and take a picture(with flash turned off). You should see a black shutter door clicking shut in the lens. When the camera acts up, look inside the lens again. If the door is staying shut full time, that is your problem.

If the specks are just on your viewfinder focussing screen, they won't be on your pics. If they're on both your pics and focussing screen, you need to find someone else to clean your camera. Cleaning either your CCD sensor or your screen yourself can leave scratches. Changing lenses often can suck dust into the inside if the body is dusty. Try another repair shop for thorough cleaning - it shouldn't cost more than $50.